Seattle faces its daily temperature check on April 28, with the market asking whether the city will see a high of 70°F or above. At 0% YES odds, traders overwhelmingly expect cooler conditions typical of late April in the Puget Sound region. Late April in Seattle typically brings spring weather in the 50s to mid-60s, and the current market pricing reflects significant skepticism that this particular date will break into 70-degree territory. The 0% probability reading indicates traders see this threshold as highly unlikely based on both historical seasonal patterns and available medium-range weather forecasts. Seattle-Tacoma International Airport provides the official temperature data that drives market resolution. Understanding this market requires recognizing Seattle's unique maritime climate influence, where proximity to the Pacific Ocean moderates temperature extremes throughout spring. The market's extreme bearishness on a 70°F high reflects decades of climate data showing that April days exceeding 70°F remain rare in Seattle.
Deep dive — what moves this market
Seattle's climate in late April occupies a transitional zone in spring, where highs typically range from the upper 50s to the mid-60s depending on synoptic weather patterns and the specific influence of moisture-laden maritime air masses from the Pacific. The Puget Sound region's weather is fundamentally shaped by its proximity to the ocean, which acts as a thermal moderator, limiting both extreme cold snaps and heat waves during spring months. Reaching 70°F in Seattle on any given day in late April is unusual but not meteorologically impossible—it requires either a strong high-pressure system pushing warm air northward from California and the interior West, or an unusual warm maritime flow with tropical air intrusion. The current 0% odds suggest traders have already priced in extremely low confidence in such a scenario occurring specifically on April 28. Historically, Seattle does experience occasional warm April days, with the median high in late April around 62°F and rare outlier warm days occasionally touching the upper 60s to low 70s, though consistently achieving 70°F or above on a specific forecasted date remains statistically uncommon. The market's near-zero odds align with seasonal climate normals and typical spring variability patterns. What could flip this market toward YES? An unusually strong Pacific high-pressure system building into the region, combined with downstream upper-level ridging, could push temperatures significantly higher. Alternatively, a warm front preceding a larger storm system could deliver tropical air masses northward. The NO case—currently priced at near-certainty—is supported by Seattle's typical late-spring climate regime, the persistent marine boundary layer, and the statistical rarity of 70°F+ days in April. Real-time weather forecasts from NOAA and European modeling centers released April 27-28 would represent the primary new information traders might respond to.
What traders watch for
Latest NOAA extended forecast and any updated high-temperature predictions released for Seattle on April 28
Position and strength of any high-pressure systems tracking toward the Pacific Northwest region during this period
Current and forecasted jet stream patterns that could push warmer air masses into the Puget Sound area
Any National Weather Service advisories or warnings related to warmer-than-normal conditions across western Washington state
How does this market resolve?
The market resolves YES if the highest recorded temperature at Seattle-Tacoma International Airport reaches 70°F or higher on April 28, 2026, based on official National Weather Service data. It resolves NO if the high remains below 70°F.
Prediction markets aggregate trader expectations into real-time probability estimates. On Polymarket Trade, every market question resolves YES or NO based on a specific event outcome; traders buy shares of the side they believe will resolve positively. Prices range 0¢ (certain no) to 100¢ (certain yes) and naturally reflect the crowd-implied probability of YES. This page summarizes the market state for readers arriving from search; for live trading (place orders, see order book depth, execute a trade) open the full interactive page linked above.
